Running Wild With Bear Grylls

Actor Rob Riggle joins Bear Grylls on an adventure through Iceland's Vatnajokull Glacier.[National Geographic]

Actress Brie Larson accompanies Bear Grylls on a jungle adventure across a remote island in the Gulf of Panama.[National Geographic]

Bear Grylls and actor Zachary Quinto race the clock to traverse a dense Panamanian jungle before an impending storm makes landfall.[National Geographic]

Bear Grylls leads actress Cara Delevingne up the mountains of Sardinia, where she pulls herself across a horizontal line suspended 200 feet in the air and rappels down a waterfall.[National Geographic]

Actor Armie Hammer and Bear Grylls scuba dive in search of a sea cave used by smugglers.[National Geographic]

Bear Grylls and former WWE World Champion Dave Bautista trek through the Arizona desert.[National Geographic]

Actor Joel McHale joins Bear Grylls for an adventure in the Arizona desert.[National Geographic]

Bear Grylls puts actor Channing Tatum's survival skills to the test in the wilds of Norway.[National Geographic]

Radio personality Bobby Bones joins Bear Grylls in a massive Norwegian fjord where danger lurks at every turn.[National Geographic]

Rock climber Alex Honnold joins Bear for an adventure through the Swiss Alps.[National Geographic]